engineering mathematics MCQ #425

The circle x² + y² + 6x - 8y + 9 = 0 has radius ___.

engineering mathematics MCQ #425

  1. Question 1

    Q1. The circle x² + y² + 6x - 8y + 9 = 0 has radius ___.

    • A) 4
    • B) 5
    • C) 6
    • D) 7

    Answer: 5

    Explanation: Complete the square: (x+3)² + (y-4)² = 16 + 16 - 9 = 25 → r = 5.